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Medium-induced modification of groomed and ungroomed jet mass and angularities in Pb-Pb collisions at √sNN = 5.02 TeV

The ALICE Collaboration presents a new suite of jet substructure measurements in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair sNN=5.02 Image 1. These measurements provide access to the internal structure of jets via the momentum and angle of their constituents, probing how the...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Berdnikova, Anastasia (Author) , Bergmann, Luisa (Author) , Bórquez Cárcamo, Andrés G. (Author) , Danisch, Meike (Author) , Feuillard, Victor (Author) , Fokin, Ilya D. (Author) , Glässel, Peter (Author) , Nath, Abhishek (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schlepper, Felix (Author) , Skorodumovs, Georgijs (Author) , Stachel, Johanna (Author) , Stiefelmaier, Stephan (Author) , Veen, Casper Arie van (Author) , Windelband, Bernd (Author) , Yüncü, Alperen (Author) , Zanone, Federica (Author) , Zhang, Biao (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal) Editorial
Language:English
Published: May 2025
In: Physics letters
Year: 2025, Volume: 864, Pages: 1-13
ISSN:1873-2445
DOI:10.1016/j.physletb.2025.139409
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1016/j.physletb.2025.139409
Verlag, kostenfrei, Volltext: https://www.sciencedirect.com/science/article/pii/S0370269325001698
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Author Notes:ALICE Collaboration

MARC

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246 3 3 |a Medium-induced modification of groomed and ungroomed jet mass and angularities in Pb-Pb collisions at square root s NN = 5.02 TeV 
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500 |a Online verfügbar 24 March 2025, Version des Artikels 4 April 2025 
500 |a Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, NN ist dabei tiefgestellt 
500 |a ALICE Collaboration: S. Acharya, V. Anguelov, A. Berdnikova, L. Bergmann, A.G. Borquez Carcamo, M.C. Danisch, V.J.G. Feuillard, I. Fokin, P. Glässel, A. Nath, K. Reygers, R. Schicker, F. Schlepper, G. Skorodumovs, J. Stachel, S.F. Stiefelmaier, C.A. van Veen, B. Windelband, A. Yuncu, F. Zanone, B. Zhang [und viele weitere] 
500 |a Gesehen am 10.11.2025 
520 |a The ALICE Collaboration presents a new suite of jet substructure measurements in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair sNN=5.02 Image 1. These measurements provide access to the internal structure of jets via the momentum and angle of their constituents, probing how the quark-gluon plasma modifies jets, an effect known as jet quenching. Jet grooming additionally removes soft wide-angle radiation to enhance perturbative accuracy and reduce experimental uncertainties. We report the groomed and ungroomed jet mass mjet and jet angularities λακ using κ=1 and α>0. Charged-particle jets are reconstructed at midrapidity using the anti-kT algorithm with resolution parameter R=0.2. A narrowing of the jet mass and angularity distributions in Pb-Pb collisions with respect to pp is observed and is enhanced for groomed results, confirming modification of the jet core. By using consistent jet definitions and kinematic cuts between the mass and angularities for the first time, previous inconsistencies in the interpretation of quenching measurements are resolved, rectifying a hurdle for understanding how jet quenching arises from first principles and highlighting the importance of a well-controlled baseline. These results are compared with a variety of theoretical models of jet quenching, providing constraints on jet energy-loss mechanisms in the quark-gluon plasma. 
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